PIR motion Sensor + Radio Send & Receive

Note the PIR sensor needs a separate battery pack as it needs 5v and the micro:bit can only supply 3.3v. Remember it needs to be grounded on both the micro:bit and the second battery pack.. After detecting motion it resets itself after about 5-10 seconds.

# microbit 1 with PIR on pin 0 sending results using radio

from microbit import *

import radio

radio.on()

intruder_state_now = 1

intruder_state_old = 0

while True:

intruder_state_now = pin0.read_digital()

if intruder_state_now != intruder_state_old:

intruder_state_old = intruder_state_now

radio.send(str(intruder_state_now))

display.show(str(intruder_state_now))

# microbit 2 displaying results received by radio

from microbit import *

import radio

radio.on()

while True:

x = radio.receive()

if x == '1':

display.show('1')

if x == '0':

display.show('0')

sleep(1000)

The diagram below shows how to wire the sensor to a larger battery pack while still grounding it on the microbit by using a small connector block. You can do this without the connector block by twisting the wires together and securing them with electrical tape.